事件驱动模型,观察者模式 同一个事件,多个监听器 const EventEmitter = require("events"); const myEmitter = new EventEmitter(); // 这里是两个观察者,观察对应的对象,等待对象做出动作 myEmitter.on("newSale", () => { console.log("There was a new sale"); }); myEmitte
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